ImageDiffCameraInput.pde

import gab.opencv.*;
import processing.video.*;

Capture video;

OpenCV bg;
OpenCV opencv;

PImage curBg;
PImage colorDiff;

float brightness = 0;

void setup() {
  size(640, 480);
  
  video = new Capture(this, width, height);
  video.start();

  bg = new OpenCV(this, width, height);
  opencv = new OpenCV(this, width, height); 
  curBg = bg.getSnapshot();   

  updateDiff();
}

void updateDiff() {
  opencv.loadImage(video);
  opencv.diff(curBg);
  colorDiff = opencv.getSnapshot();
}

void draw() {
  pushMatrix();
  scale(0.5);
  image(colorDiff, 0, 0);
  image(curBg, width, 0);
  popMatrix();
  rect(0, 0, brightness, 10);
}

void keyPressed() {
  if(key == ' ') {
    bg.loadImage(video);
    curBg = bg.getSnapshot();
  }
}

void captureEvent(Capture c) {
  key = ' ';
  keyPressed();
  c.read();
  updateDiff();
  brightness = 0;
  colorDiff.loadPixels();
  for(int y = 0; y < height; y++) {
    for(int x = 0; x < width; x++) {
      brightness += brightness(colorDiff.get(x, y));
    }
  }
  brightness /= (width * height);
  
  println(brightness);
}